The Swedish company Hovding has built a bicycle helmet you can’t see. It’s a collar that deploys like an air bag when needed. Before:
A better look:
Here’s a video of a bunch of crash tests:
And another more inspirational video:[vimeo http://vimeo.com/43038579]
I know helmets mess up your hair, but I’m not sure people will flock to a $535 bulky collar instead. Still, cool.